Late-phase human herpesvirus 6B reactivation in hematopoietic stem cell transplant recipients

Hiroki Miura, Yoshiki Kawamura, Fumihiko Hattori, Makito Tanaka, Kazuko Kudo, Masaru Ihira, Hiroshi Yatsuya, Yoshiyuki Takahashi, Seiji Kojima, Tetsushi Yoshikawa

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4 Citations (Scopus)


Background: We sought to determine whether late-phase human herpesvirus 6B (HHV-6B) infection in hematopoietic stem cell transplant (HSCT) recipients was associated with serious outcomes and mortality. Methods: The occurrence and course of HHV-6B infection was monitored for at least 60 days after transplant using virus isolation and real-time polymerase chain reaction. Risk factors for late-phase HHV-6B infection were examined, and the propensity score was calculated with significant risk factors. The inverse probability-weighted multivariable logistic regression analysis was performed to estimate odds ratios (ORs) and the 95% confidence intervals (95% CI) for mortality. Results: Late-phase HHV-6B infection was observed in 12/89 (13.5%) of the HSCT recipients. Older age (OR: 10.3, 95% CI: 2.1/72.9, P =.0027), hematologic malignancy (OR: 10.3, 95% CI: 1.8/97.1, P =.0063), unrelated donor transplantation (OR: 5.3, 95% CI: 1.1/36.0, P =.0345), and sex-mismatched donor transplantation (OR: 6.3, 95% CI: 1.4/39.5, P =.0149) were identified as risk factors for late-phase HHV-6B infection. Fifteen subjects died (17%). Inverse probability-weighted multivariable logistic model analysis revealed that late-phase HHV-6B infection was an independent risk factor for mortality (OR: 4.2, 95% CI: 1.7/11.0, P =.0012). Among 5 of the fatal cases of late-phase HHV-6B infection, viral infection might be associated with severe clinical manifestations. Conclusion: Late-phase HHV-6B infection in HSCT recipients was associated with worse outcomes. The full spectrum of clinical features of the infection has not been fully elucidated, and therefore, recipients with high-risk factors for late-phase HHV-6B infection should be carefully monitored.

Original languageEnglish
Article numbere12916
JournalTransplant Infectious Disease
Issue number4
Publication statusPublished - 08-2018

All Science Journal Classification (ASJC) codes

  • Infectious Diseases
  • Transplantation


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